| 法规工况下轻型汽油车氨排放特征 |
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| 引用本文： | 吉江林,赵海光,郑丰,尹航,丁焰,何超.法规工况下轻型汽油车氨排放特征[J].环境科学研究,2022,35(5):1176-1182. |
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| 作者姓名： | 吉江林 赵海光 郑丰 尹航 丁焰 何超 |
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| 作者单位： | 1.西南林业大学机械与交通学院，云南 昆明 650224 |
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| 基金项目： | 国家自然科学基金项目(No.51968065)；;云南省教育厅科学研究基金项目(No.2021Y221)~~； |
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| 摘 要： | 为掌握轻型汽油车NH3排放实际状况，以一辆配备三元催化转化器(three-way catalytic converter，TWC)的国Ⅵ轻型汽油车为研究对象，分别在全球轻型汽车驾驶工况(worldwide light-duty test cycle，WLTC)、中国轻型汽车行驶工况(China light-duty vehicle test cycle，CLTC)和美国联邦测试规程(federal test procedure，FTP-75)下进行NH3排放测试，分析WLTC工况下的瞬时NH3排放特征，以及不同环境温度(?7、0、23、35 ℃)对NH3排放的影响，并对比3种测试工况下的NH3排放因子. 结果表明:①在WLTC工况下，车辆冷起动前50 s未检测到NH3，NH3排放主要集中在低速段和中速段(前900 s)，在高速段和超高速段，仅有极少量的NH3生成. 轻型汽油车在低速(v<40 km/h)的加速区间内，NH3排放量较高. ②随着环境温度的升高，NH3排放因子呈下降趋势，35 ℃时略微有所上升. 其中，?7 ℃下低速段的NH3排放因子分别是0、23和35 ℃下的1.4~2.2倍；在WLTC工况下，各种测试环境温度下车辆的NH3排放因子均表现为低速段>中速段>高速段>超高速段；在3种工况下，轻型汽油车的NH3排放因子差异较大. 其中，测试车辆在WLTC工况下的排放因子最小. 研究显示，在低温(?7 ℃)环境下轻型汽油车NH3的排放量相对较高.
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| 关 键 词： | 轻型汽油车 三元催化转化器 NH3排放因子 环境温度 测试工况 |
| 收稿时间： | 2021-10-18 |
Ammonia Emission Characteristics for the Light-Duty Gasoline Vehicle under Regulatory Cycles |
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| JI Jianglin,ZHAO Haiguang,ZHENG Feng,YIN hang,DING Yan,HE Chao.Ammonia Emission Characteristics for the Light-Duty Gasoline Vehicle under Regulatory Cycles[J].Research of Environmental Sciences,2022,35(5):1176-1182. |
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| Authors: | JI Jianglin ZHAO Haiguang ZHENG Feng YIN hang DING Yan HE Chao |
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| Abstract: | In order to understand the current status of NH3 emissions from light-duty gasoline vehicles, NH3 emissions from a China 6 light-duty gasoline vehicle equipped with a three-way catalytic converter (TWC) were tested under three test cycles, respectively, including worldwide light-duty test cycle (WLTC), China light-duty vehicle test cycle (CLTC), and federal test procedure (FTP-75) operating cycles. Instantaneous NH3 emission characteristics and the impact of different ambient temperatures (?7, 0, 23, 35 ℃) to NH3 emissions under WLTC cycle were analyzed, moreover, the NH3 emission factors under three test cycles were also compared. The results showed that no NH3 emission was observed during the first 50 s of the cold start under WLTC cycle. NH3 emissions were concentrated primarily in the low speed and medium speed phase (first 900 s), while few NH3 emissions occurred in the high speed and ultra-high speed phase. Light-duty gasoline vehicle emitted more NH3 in the acceleration range at low speeds (v<40 km/h). The NH3 emission factors decreased with the increasing ambient temperature, but increased at 35 °C slightly. The NH3 emission factor of low-speed phase at ?7 °C was 1.4 to 2.2 times greater than at 0, 23 and 35 °C. Under WLTC cycle, the NH3 emission factors of the vehicle at various test ambient temperatures were in the order of low speed phase > medium speed phase > high speed phase > ultra-high speed phase. The NH3 emission factors of the light-duty gasoline vehicle differed significantly under the three cycles, and the WLTC cycle showed the smallest emission factor. The results indicated that NH3 emissions from light-duty gasoline vehicle were relatively high at low temperatures (?7 °C). |
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